(6.2) 5.2

A company manufactures tennis balls. When its tennis balls are dropped onto a concrete surface from a height of

100

inches, the company wants the mean height the balls bounce upward to be

55.2

inches. This average is maintained by periodically testing random samples of

25

tennis balls. If the t-value falls between

t0.98

and

t0.98,

then the company will be satisfied that it is manufacturing acceptable tennis balls. A sample of

25

balls is randomly selected and tested. The mean bounce height of the sample is

56.1

inches and the standard deviation is

0.25

inch. Assume the bounce heights are approximately normally distributed. Is the company making acceptable tennis balls?

Question content area bottom

Part 1

Find

t0.98

and

t0.98.

t0.98	=	negative 2.4922.492
t0.98	=	2.4922.492

(Round to three decimal places as needed.)

Part 2

Find the t-value.

t-value=enter your response here